A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 76
e is placed. Thiscircuit is opened by a spring,on the removal of the pressure.Some forms of push-buttons areshown in Figs. %%, 89 and 90. A floor-push for dining-roomsand offices is shown in Fig.90. Fig. 88 shows the generalappearance of an ordinary bell-push. The arrangement of theinterior spring…
Electricity · Electrical engineering
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